c2d03a920ec7 rewrote the action printing in print_rule() from OpenBSD,
which has no natpass, and dropped the "pass" keyword. A ruleset
loaded from "pfctl -sn" output therefore lost its nat-pass semantics.
Add a parser test covering nat, rdr, rdr log and binat with pass.
Fixes: c2d03a920ec7 ("pfctl: fix anchortypes bounds test")
MFC after: 1 week
Sponsored by: Rubicon Communications, LLC ("Netgate")